Sewage discharge device of variable water-saving toilet

ABSTRACT

The present invention relates to a sewage discharge device of a variable water-saving toilet, the device discharging sewage in a bowl to the outside by the load of an auxiliary tank, when a part of tap water branches off from a tap water inflow path such that the tap water stored in the auxiliary tank provided around the outer periphery of a sewage discharge pipe of the toilet reaches a predetermined amount or more.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to a sewage discharge device for avariable type water-saving flush toilet, and more particularly, to asewage discharge device for a variable type water-saving flush toilet,in which a part of flushing water flowing through a flushing waterinflow passage is branched so that when flushing water stored in anauxiliary tank disposed at the outer circumference of a sewage dischargetube of the flush toilet reaches a preset amount, sewage contained inthe a bowl is discharged to the outside by the auxiliary tank's ownweight.

2. Description of Related Art

In general, a flush toilet employs the principle of a siphon in which acertain amount water is contained in a toilet bowl to smoothly removefoul odor or excretions rising from a waste outlet port and cleanly washthe inside of the bowl.

This siphon principle refers to a principle in which when a water levelin an inverted U-shaped tube forms an equilibrium state with that in thetoilet bowl, water is in a stagnant state whereas when the water levelin the toilet bowl rises suddenly, water contained in the bowl isdischarged to the outside due to a difference in the pressure betweenthe toilet bowl and the siphon tube in a relatively low pressure statewhile being accompanied by an increase in pressure inside the toiletbowl.

As shown in FIG. 1, a typical flush toilet includes a bowl 2 configuredto contain a predetermined amount of water, and a waste wash water tank1 disposed at a higher position than that of the bowl 2 and configuredto store a predetermined amount of waste wash water, the waste washwater tank being connected to the bowl 2 through a water supply passage2 a closed by a packing valve 5, so that the packing valve 5 operated incooperation with a flush lever installed at the waste wash water tank 1opens a water feed port 10 by the manipulation of the flush lever 3 toallow water stored in the waste wash water tank 1 to be rapidly suppliedto the bowl 2 through the water supply passage 2 a. Thus, wasteincluding feces and urine precipitated in the bowl is discharged to theoutside through a water drainage passage 2 b via a drain trap 2 c by thesiphon effect in which water to be drained along the water drainagepassage 2 b of the bowl is created by a hydraulic pressure generated inthe bowl 2 with increased water level in the bowl 2.

However, such a conventional flush toilet as described above entails aproblem in that a water level higher than a height of the drain trap 2 cshould be maintained to prevent backflow of foul toilet odor in thebowl, and an amount of water capable of overcoming a hydraulic pressureat the height of the drain trap 2 c should be used during flushing ofthe toilet, leading to an increase in the amount of water consumed.

Furthermore, since the existing flush toilet should conform to aregulation prescribing that the diameter of a sewage discharge tubeshall be set to be more than 45 mm, i.e., generally about 45-55 mm,which was determined according to KS standards to smoothly dischargesewage from the bowl, so called the siphon phenomenon is caused to occurin order to wash sewage inside the bowl by a suction force. For thepurpose of causing the siphon phenomenon, it is required that water ofmore than 60 ml should be supplied to the inside of the bowl at least atone time. To this end, in the case of the conventional flush toilet, awater tank is installed and a certain amount of water is stored thereinat normal times, and then water is supplied to the inside of the bowlthrough the water supply passage fluidically communicating with thewater tank and the bowl by the opening of an opening/closing stopperattached to an aperture of a water discharge tube having a diameter ofabout 65 mm or less, which was installed at the inside of the water tankso that the siphon phenomenon occurs to perform the washing operation.

Therefore, the conventional flush toilet also entails a problem in thatalthough flushing water is supplied to the inside of the bowl from awater pipe having an aperture of about 15 mm, the diameter of the sewagedischarge tube of the bowl is typically not more than 45-55 mm, and thusthe siphon phenomenon cannot occur and the flushing water is dischargedto the outside through the sewage discharge tube as it is, which makesit impossible to wash sewage contained in the bowl.

For this reason, since a male urinal is directly connected to a waterpipe in use, automatic washing has been generalized by a sensor or thelike. However, a toilet stool cannot wash sewage by its directconnection to the water pipe for the above reason, and thus an automatictoilet stool could not be commercialized.

Further, the existing flush toilet (partially, a flush value type toiletproduct with a water feed tube having an aperture of 1 inch is excluded)should necessarily have a water tank function to enable washing of thebowl. For this reason, there is also a spatial restriction because thesize of the flush toilet cannot be reduced due to a design limitationand the water tank. In addition, a water tank and a toilet stand areintegrally manufactured of earthenware into a so-called “one-piece typeflush toilet), a defective rate increases and thus a production yielddecreases, resulting in a rise of the cost of earthenware products.

Moreover, there may be the case where even though water leakage occursdue to a defect of a water feed and discharge tube installed at theinside of the water tank, it is difficult for a user to easily detectthe water leakage and thus the user cannot recognize the water leakageuntil he or she checks a bill for the water supply and drainage service.In addition, since a so-called flash toilet used in a common restroom ora public place such as an office building or the like does not include awater tank, it should be additionally equipped with a water tube havinga diameter of 25 mm (1 inch) separately from a general water pipe havinga diameter of 15 mm so that it can be directly connected to the waterpipe to supply a large amount of water at one time in use. To this end,vast installation cost is additionally required, and a so-called “waterhammer” phenomenon during the operation of the flush lever isaccompanied by a serious noise, which makes it impossible to use theflash toilet in a general home environment.

Further, Korean Patent No. 10-1131810 discloses a water-saving flushtoilet having a variable double straight tube, in which the variabledouble straight tube is configured to be operated in an existing waterflow path and a bowl rim manner. When a water level inside a bowl duringthe supply of flushing water from a tap, the variable double straighttube is downwardly moved so that sewage can be discharged, but ahydraulic pressure of the flushing water drops drastically in a watersupply passage fluidically communicating with a water tank and the bowland a water supply passage formed in the bowl rim, which ultimatelymakes it impossible to use the flushing water from a tap, and thus thereis caused a problem associated with the washing of sewage contained inthe bowl. In addition, it is difficult to control the delay of thesewage discharge time when the variable double straight tube isdownwardly moved during the discharge of sewage, occasionally resultingin backflow of some sewage.

Moreover, Korean Patent No. 10-1131810 also discloses that flushingwater should be supplied to the bowl until the variable double straighttube is downwardly moved to discharge sewage, and the supplied flushingwater is immediately mixed with sewage contained in the bowl and thus isalso changed into sewage. Resultantly, waste wash water is squandered,leading to a half-reduction in the water-saving effect.

Furthermore, Korean Patent No. 10-1131810 also discloses that thevariable double straight tube uses water stored in an auxiliary tankdisposed on the outer circumference of a sewage discharge tube as a partof sewage to be discharged, and thus the variable double straight tubeis clogged by sewage introduced into the auxiliary tank after a lapse ofa predetermined period of time, which causes an erroneous operation ofthe sewage discharge tube, leading to deterioration of durability of thesewage discharge tube.

SUMMARY OF THE INVENTION

Accordingly, the present invention has been made to solve theaforementioned problems occurring in the prior art, and it is an objectof the present invention to provide a sewage discharge device for avariable type water-saving flush toilet in which a part of flushingwater flowing through a flushing water inflow passage is branched and asewage discharge unit connected to an outlet port of a bowl by a bellowstube is elastically moved downwardly by the branched flushing water'sown weight so that the sewage can be sequentially discharged, and thesewage discharge unit can elastically returns to its original positionafter completion of the discharge of the sewage contained in the bowl.

Another object of the present invention is to provide a sewage dischargedevice for a variable type water-saving flush toilet, which candischarge sanitary sewage contained in a bowl of the flush toilet usingflushing water directly supplied from a water pipeline even without awater tank.

Still another object of the present invention is to provide a sewagedischarge device for a variable type water-saving flush toilet, in whicha sewage discharge unit can be stably operated if flushing watersupplied from a water pipeline is more than a certain pressure despite achange in the pressure of water so that since the sewage dischargedevice is hardly influenced by the pressure of water supplied, a washingperformance can be maintained stably.

Yet another object of the present invention is to provide a sewagedischarge device for a variable type water-saving flush toilet, in whichflushing water supplied from a water pipeline can be used so that thesewage discharge device can contribute to diversification of a toiletbowl design, reductions in the production cost and installation space,and generalization of the use of an automatic flush toilet employing asensor by eliminating the necessity of a water tank necessary for anexisting flush toilet.

To achieve the above objects, according to a preferred embodiment of thepresent invention, there is provided a sewage discharge device for avariable type water-saving flush toilet, including: a toilet body 100installed on a floor or a wall, the toilet body 110 including a flushingwater inlet port 111 formed therein so as to allow for inflow offlushing water flowing through a flushing water inflow passage 101 intowhich the flushing water is introduced from the outside, a bowl 110opened at a top thereof and configured to store a certain amount ofsewage therein, a connection tube 120 configured to discharge sewagefrom the bowl 110, and a cover part 140 configured to cover a rearportion of the bowl 110 and allows sewage discharged through theconnection tube 120 to be induced to a bottom tube 130; a corrugatedtube 200 connected to the connection tube 120, the corrugated tube 200being configured to form a flow path of sewage drained from the bowl 110and being capable of bent in one direction; a flushing water branchingunit 300 fluidically connected with the flushing water inflow passage101 and to allow a part of the flushing water flowing through theflushing water inflow passage 101 to be branched when the flushing wateris introduced into the bowl 110; a sewage discharge tube 400 comprising:a main discharge tube 410 connected to the corrugated tube 200 andconfigured to discharge sewage to the outside: and an auxiliary tank 420disposed on an outer circumferential surface of the main discharge tube410 and configured to store therein flushing water branched from theflushing water branching unit 300 and supplied thereto, the auxiliarytank having an auxiliary discharge hole 422 formed thereon to allowflushing water stored in a lower portion thereof to be drained, whereinwhen the flushing water branched from the flushing water branching unit300 reaches a preset amount, the auxiliary tank 420 is downwardly movedby its own weight so that sewage is discharged to the outside throughthe main discharge tube 410, and the time during which sewage isdischarged to the outside through the main discharge tube 410 is delayedin proportion to a discharge speed at which the flushing water suppliedto the auxiliary tank 420 is drained through the auxiliary drain hole422; and an elastic unit 500 configured to elastically interconnect theconnection tube 120 and the sewage discharge tube 400, and to allow thesewage discharge tube 400 to be oriented in an upright state by anelastic force of the elastic unit upon the interruption of the supply offlushing water.

In addition, in the sewage discharge device for a variable typewater-saving flush toilet of the present invention, the elastic unit mayinclude: a first hanging member mounted on a connection tubeinterconnecting the connection tube and the corrugated tube so as to beprotruded to both sides, the first hanging member having a pair of firsthanging holes formed at each of both end portions thereof; a pair ofsecond hanging members mounted on both sides of the sewage dischargetube, each of the second hanging members having a pair of second hangingholes formed thereon so as to be spaced apart from each other; and apair of elastic members each connected at one end thereof to any one ofthe pair of second hanging holes of each of the pair of second hangingmembers and connected at the other end thereof to each of the pair offirst hanging holes of each of both end portions of the first hangingmember.

In addition, the sewage discharge device for a variable typewater-saving flush toilet of the present invention, may further includean odor prevention unit 600 disposed inside the corrugated tube 200 orthe sewage discharge tube 400, the odor prevention unit being openedwhen the sewage flows through the corrugated tube 200 or the sewagedischarge tube 400 and closed when the sewage does not flowtherethrough.

Further, in the sewage discharge device for a variable type water-savingflush toilet of the present invention, the flushing water branching unit300 may include: a branching corrugated tube 310 coupled at an upper endthereof to the flushing water inflow passage 101 and connected at alower end thereof to the auxiliary tank 420; and a branched water inletpart 320 connected to the upper end of the branching corrugated tube 310and disposed at the inside of the flushing water inflow passage 101.

In addition, in the sewage discharge device for a variable typewater-saving flush toilet of the present invention, the flushing waterbranching unit 300 may further include an odor prevention valve 321disposed at an entrance portion of the branched water inlet part 320,and configured to be opened by a hydraulic pressure when flushing wateris supplied to the flushing water inflow passage 101 and closed by theodor prevention valve's own weight when the supply of the flushing wateris interrupted so that foul toilet odor is prevented from flowing intothe flushing water inflow passage 101.

In addition, in the sewage discharge device for a variable typewater-saving flush toilet of the present invention, the odor preventionunit 600 may include an odor prevention member 610 that is disposed atthe inside of the sewage discharge tube 400, is formed in a hollowshape, and is made of vinyl or thin rubber having flexibility, whereinone end of the odor prevention member 610 is fixed to one end of aninner circumference of the sewage discharge tube 400, and wherein theother end of the odor prevention member 610 is disposed to form a freeend along the other end of the inner circumference of the sewagedischarge tube 400, whereby when sewage contained in the bowl 110 flowsinto the corrugated tube 200 through connection tube 120, it isintroduced into a hollow space of the odor prevention member 610 to openthe odor prevention member 610, and whereby when the discharge of thesewage from the sewage discharge tube 400 is completed, the outwardshape of the other end of the odor prevention member 610 disposed toform the free end is changed to be closely abutted against the sewagedischarge tube 400.

EFFECTS OF THE INVENTION

As described above, the present invention has an advantageous effect inthat the auxiliary tank is disposed on the outer circumference of thesewage discharge tube to supply a part of flushing water flowing throughthe flushing water inflow passage to the auxiliary tank through anauxiliary corrugated tube so that sewage can be rapidly discharged tothe outside by rotating the sewage discharge tube by the auxiliarytank's own weight.

Further, according to the present invention, when flushing water is notsupplied, the sewage discharge tube is not displaced so that although alarge amount of sewage is supplied temporarily, the amount of watercontained in the bowl can be stably maintained without affecting thesewage discharge tube, thereby maximally preventing adhesion of sewageonto the inside of the bowl or foul odor.

In addition, the present invention has an effect in that when the amountof the flushing water supplied to the auxiliary tank is more than apreset level, the operation of the sewage discharge tube can beperformed stably, thereby maximally preventing a deterioration in thewashing performance according to a change in the pressure of watersupplied.

Moreover, according to the present invention, a part of flushing waterflowing through the flushing water inflow passage is supplied to theauxiliary tank via the flushing water branching unit to allow the agedischarge tube to be downwardly operated elastically so that sewagecontained in the bowl can be discharged to the outside before flushingwater is supplied to the bowl, thereby maximizing the water savingeffect.

Besides, according to the present invention, since it is possible tocontrol the effect of extending the sewage discharge time depending onthe weight of the auxiliary tank by the elastic force of the sewagedischarge tube rotated downwardly upon the discharge of sewage, backflowof the sewage or the remaining water can be suppressed, thereby ensuringa perfect washing performance.

In addition, the present invention has an effect in that some flushingwater is supplied to the auxiliary tank so that an erroneous operationof the sewage discharge tube that may occur during the use of the sewagecan be prevented.

In addition, the present invention has an effect in that a hollowed odorprevention member made of vinyl or thin rubber is disposed inside thesewage discharge tube, thereby minimizing backflow of foul toilet odorto the bowl of the toilet body after the discharge of sewage.

Further, the present invention has an effect in that it can be appliedto a flush toilet employing a water tank such as an existing flushtoilet, as well as sewage contained in the bowl of the flush toilet canbe discharged to the outside by using flushing water supplied from thewater pipeline even without any water tank, thereby achievinggeneralization of the automatic flush toilet.

Furthermore, the present invention has an effect in that it canimplement diversification of the design of the flush toilet and reducethe production cost of the flush toilet through a decrease of defectiverate in the production process by eliminating the necessity of a watertank.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the presentinvention will be apparent from the following detailed description ofthe preferred embodiments of the invention when taken in conjunctionwith the accompanying drawings, in which:

FIG. 1 is a schematic cross-sectional view illustrating a configurationof a conventional flush toilet according to the prior art;

FIGS. 2 and 3 are schematic cross-sectional views illustrating a statein which sanitary sewage is not discharged in a sewage discharge devicefor a variable type water-saving flush toilet according to the presentinvention;

FIGS. 4 and 5 are schematic cross-sectional views illustrating a statein which sanitary sewage is discharged in a sewage discharge device fora variable type water-saving flush toilet according to the presentinvention; and

FIGS. 6 and 7 are exploded perspective views illustrating a state inwhich a sewage discharge tube and an elastic unit are connected to eachother in a sewage discharge device for a variable type water-savingflush toilet according to the present invention.

EXPLANATION ON SYMBOLS

-   -   100: toilet body    -   200: corrugated tube    -   300: flushing water branching unit    -   310: branching corrugated tube    -   320: branched water inlet part    -   321: odor prevention valve    -   400: sewage discharge tube    -   410: main discharge tube    -   420: auxiliary tank    -   500: elastic unit    -   600: odor prevention unit

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter the configuration of a sewage discharge device for avariable type water-saving flush toilet according to the presentinvention will be described in detail with reference to the accompanyingdrawings.

FIGS. 2 and 3 are schematic cross-sectional views illustrating a statein which sanitary sewage is not discharged in a sewage discharge devicefor a variable type water-saving flush toilet according to the presentinvention, FIGS. 4 and 5 are schematic cross-sectional viewsillustrating a state in which sanitary sewage is discharged in a sewagedischarge device for a variable type water-saving flush toilet accordingto the present invention, and FIGS. 6 and 7 are exploded perspectiveviews illustrating a state in which a sewage discharge tube and anelastic unit are connected to each other in a sewage discharge devicefor a variable type water-saving flush toilet according to the presentinvention.

Referring to FIGS. 2 and 4, a tankless water-saving flush toilet of thepresent invention roughly includes a toilet body 100, a corrugated tube200, a flushing water branching unit 300, a sewage discharge tube 400,and an elastic unit 500.

The configuration of each of the elements will be described hereinafter,

Toilet Body 100

The toilet body 100 according to the present invention is installed on afloor or a wall of a toilet, a restroom, a bathroom or the like.

The toilet body 100 includes a flushing water inlet port 111 formedtherein so as to allow for inflow of flushing water flowing through aflushing water inflow passage 101 into which the flushing water isintroduced from the outside, a bowl 110 opened at a top thereof andconfigured to store a given amount of sewage therein. The flushing wateris supplied to the bowl 110 through the flushing water inlet port 111 towash the inside of the bowl 110. When a valve is opened through aflushing water valve (not shown), flushing water is introduced into theflushing water inflow passage 101 and is involved in washing the bowl110.

In addition, the toilet body 100 includes a connection tube 120configured to discharge sewage from the bowl 110.

Further, the toilet body 100 includes a cover part 140 that isconfigured to cover a rear portion of the bowl 110 and allows sewagedischarged through the connection tube 120 to be induced to a bottomtube 130.

Corrugated Tube 200

The corrugated tube 200 according to the present invention is connectedto the connection tube 120. That is, one end of the corrugated tube 200is connected to a distal end of the connection tube 120.

The one end of the corrugated tube 200 may be fittingly fixed to theconnection tube 120, and may be connected to the connection tube 120 ina screw fastening manner.

The corrugated tube 200 serves to form a flow path of sewage drainedfrom the bowl 110, and is a flexible tube that can be bent in onedirection by an external force.

Flushing Water Branching Unit 300

The flushing water branching unit 300 according to the present inventionis fluidically connected with the flushing water inflow passage 101 andserves to allow a part of the flushing water flowing through theflushing water inflow passage 101 to be branched when the flushing wateris introduced into the bowl 110. When the flushing water is supplied tothe bowl 110 to wash the bowl 110, some flushing water branched from theflushing water branching unit 300 from the flushing water inflow passage101 is introduced into and stored in an auxiliary tank 420 of the sewagedischarge tube 400 which will be described later so that the sewagedischarge tube 400 is rotated by the auxiliary tank's own weight, whichis involved in discharging sewage.

The flushing water branching unit 300 includes a branching corrugatedtube 310 and a branched water inlet part 320.

The branching corrugated tube 310 is coupled at an upper end thereof tothe flushing water inflow passage 101 and is connected at a lower endthereof to the auxiliary tank 420.

The branched water inlet part 320 is connected to the upper end of thebranching corrugated tube 310 and is disposed at the inside of theflushing water inflow passage 101 so that it serves to allow forintroduction of some branched flushing water. The introduced branchedwater flows into and is stored in the auxiliary tank 420 of the sewagedischarge tube 400 which will be described later through the branchingcorrugated tube 310.

In an embodiment of the present invention, the use of flushing waterdirectly supplied from a water pipeline can drain sanitary sewagecontained in a bowl 110 of the flush toilet even without a water tank.

Moreover, preferably, the flushing water branching unit 300 furtherincludes an odor prevention valve 321 disposed at an entrance portion ofthe branched water inlet part 320, and configured to be opened by ahydraulic pressure when flushing water is supplied to the flushing waterinflow passage 101 and closed by the odor prevention valve's own weightwhen the supply of the flushing water is interrupted so that foul toiletodor is prevented from flowing into the flushing water inflow passage101.

When provided, the odor prevention valve 321 is closed by its own weightupon the interruption of the supply of the flushing water so that foultoilet odor can be prevented from flowing into the bowl 110 and then theinterior of a toilet room through the flushing water inflow passage 101.

FIG. 5 is a cross-sectional view illustrating the operation of a sewagedischarge tube according to the present invention.

Sewage Discharge Tube 400

Referring to FIGS. 2 and 5, the sewage discharge tube 400 according tothe present invention is connected to the corrugated tube 200. Whenflushing water introduced through the flushing water branching unit 300is stored in the auxiliary tank 420, a load is applied to the sewagedischarge tube 400 to downwardly move the sewage discharge tube 400 todischarge sanitary sewage contained in the bowl to the outside.

The sewage discharge tube 400 includes a cylindrical main discharge tube410 connected to one end of the corrugated tube 200 and an auxiliarytank 420 disposed on an outer circumferential surface of the maindischarge tube 410 to circumferentially surround the main discharge tube410.

The main discharge tube 410 is connected to the corrugated tube 200 andservers to discharge sewage to the outside.

The auxiliary tank 420 is disposed on an outer circumferential surfaceof the main discharge tube 410 and is configured to store thereinflushing water branched from the flushing water branching unit 300 andsupplied thereto. The auxiliary tank 420 has an auxiliary drain hole 422formed thereon to allow flushing water stored in a lower portion thereofto be discharged. The auxiliary tank 420 serves to rotate the sewagedischarge tube 400 by its own weight of the flushing water branched fromthe flushing water branching unit 300 and stored therein upon the supplyof the flushing water to the bowl 110 to wash the bowl 110 so thatsewage contained in the bowl 110 can be discharged to the outsidethrough the main discharge tube 410 connected to the corrugated tube200. At this time, when the flushing water branched from the flushingwater branching unit 300 reaches a preset amount, the auxiliary tank 420is downwardly moved by its own weight so that sewage is discharged tothe outside through the main discharge tube 410, and the time duringwhich sewage is discharged to the outside through the main dischargetube 410 is delayed in proportion to a discharge speed at which theflushing water supplied to the auxiliary tank 420 is drained through theauxiliary drain hole 422.

Herein, the auxiliary tank 420 includes a connection part 421 disposedat an upper portion thereof so as to be connected to the branchingcorrugated tube 310, and an auxiliary drain hole 422 formed on the outercircumference of a lower portion thereof so as to allow flushing waterstored in the auxiliary tank to be drained therethrough.

By virtue of the configuration as described above, when sewage is notdischarged, the sewage discharge tube 400 is maintained at an uprightstate. In other words, when flushing water does not flow into theflushing water branching unit 300, the sewage discharge tube 400 is notrotated, so that the bowl 110 can maintain a stable amount of waterstored therein, and thus suppress adhesion of waste including feces andurine to the inner wall of the bowl 110 and generation of foul odor.

Subsequently, when a user manipulates a flushing water valve, a lever,or the like to supply flushing water to the flushing water inflowpassage 101 after responding to the call of nature, a part of flushingwater flowing through the flushing water inflow passage 101 is branchedfrom the flushing water branching unit 300 and stored in the auxiliarytank 420 of the sewage discharge tube 400.

When the flushing water branched from the flushing water branching unit300 reaches a preset amount at a state shown in FIGS. 2 and 3, thesewage discharge tube 400 is rotated downwardly by the auxiliary tank'sown weight as shown in FIGS. 4 and 5. The state in which the sewagedischarge tube 400 has been rotated is a state in which the maindischarge tube 410 is oriented horizontally to enable to dischargesewage from the bowl 110.

The flushing water stored in the auxiliary tank 420 of the sewagedischarge tube 400 is a power source of downwardly moving the maindischarge tube 410 due to the weight of the flushing water, and plays animportant role of delaying the sewage discharge time.

As such, when the sewage discharge tube 400 is rotated downwardly,sewage contained in the bowl 110 is discharged to the outside throughthe main discharge tube 410 of the sewage discharge tube 400 via thecorrugated tube 200. At this time, the branched flushing water stored inthe auxiliary tank 420 is slowly downwardly drained to the outsidethrough the auxiliary drain hole 422.

In addition, while flushing water is introduced into the bowl 110through the flushing water inlet port 111 via the flushing water inflowpassage 101, it washes the inner wall of the bowl 110 and sewage removedfrom the bowl 110 is also discharged to the outside through the maindischarge tube 410 of the sewage discharge tube 400 via the corrugatedtube 200.

The introduction of the flushing water into the bowl 110 through theflushing water inlet port 111 df via the flushing water inflow passage101 occurs slightly later than the branching of the flushing water fromthe flushing water branching unit 300. Thus, the introduction of theflushing water into the bowl 110 occurs slightly slower than or nearlysimultaneously with the rotation of the sewage discharge tube 400 todischarge sewage. As such, when flushing water is supplied to the bowl110 slightly slower than or nearly simultaneously with a sewagedischarge time point through the sewage discharge tube 400, the flushingwater supplied to the bowl 110 can wash the inside of the bowl 110without being mixed with sewage contained in the bowl 110, and thus itcan be involved in only washing the bowl 110. As such, the flushingwater supplied to the bowl 110 is involved in only washing the bowl 110,so that it can be prevented from being mixed with the sewage containedin the bowl 110 and rising in the bowl 110, and thus the bowl 110 can bemaintained in a clean state and a water-saving effect can be exhibited.

When the flushing water branched from the flushing water branching unit300 and stored in the auxiliary tank 420 is drained in a certain amountthrough the auxiliary drain hole 422, the sewage discharge tube 400returns to its original position by an elastic force of the elastic unit500 as shown in FIGS. 2 and 3. The sewage discharge tube 400 ismaintained in a rotated state until the flushing water is completelydrained to the outside from the auxiliary tank 420 of the sewagedischarge tube 400 through the auxiliary drain hole 422, and thus thedischarge time of sewage discharged to the outside through the maindischarge tube 410 of the sewage discharge tube 400 can be delayed. Assuch, the discharge time of sewage discharged to the outside through themain discharge tube 410 is delayed so that sewage contained in the bowl110 can be discharged completely without any residues of the sewage,resulting in an increase in the washing efficiency.

The adjustment of the discharge time of sewage discharged through themain discharge tube 410 of the sewage discharge tube 400 is associatedwith an increase or decrease in the drainage speed of flushing waterdrained through the auxiliary drain hole 422. Ultimately, the dischargetime of sewage depends on the size of the auxiliary drain hole 422.

The discharge time of sewage discharged through the main discharge tube410 may be controlled by variably adjusting the area of the auxiliarydrain hole 422 formed at a rear end of the auxiliary tank 420.

As shown in FIGS. 2 and 3, when the sewage discharge tube 400 returns toits original position, washed water contained in the bowl 110 isprevented from being discharged to the outside. In this case, the timepoint when the sewage discharge tube 400 returns to its originalposition is an end time point of the supply of flushing water to theflushing water inflow passage 101. At the end time point of the supplyof flushing water to the flushing water inflow passage 101, the flushingwater is supplied to only the bowl 110 so that it is half filled in thebowl 110.

FIGS. 6 and 7 are exploded perspective views illustrating a state inwhich a sewage discharge tube and an elastic unit are connected to eachother in a sewage discharge device for a variable type water-savingflush toilet according to the present invention.

Elastic Unit 500

Referring to FIGS. 6 and 7, the elastic unit 500 according to thepresent invention serves to elastically interconnect the connection tube120 and the sewage discharge tube 400, and allows the sewage dischargetube 400 to be oriented in an upright state by an elastic force of theelastic unit upon the interruption of the supply of flushing water.

Its own weight of the flushing water supplied to and stored in theauxiliary tank 420 is preferably set to be larger than the elastic forceof the elastic unit 500 so that the sewage discharge tube 400 is rotatedby the its own weight of the flushing water stored in the auxiliary tank420.

The elastic unit 500 includes: a first hanging member 510 mounted on aconnection tube 115 interconnecting the connection tube 120 and thecorrugated tube 200 so as to be protruded to both sides, the firsthanging member having a pair of first hanging holes 511 formed at eachof both end portions thereof; a pair of second hanging members 520mounted on both sides of the sewage discharge tube 400, each of thesecond hanging members 520 having a pair of second hanging holes 521formed thereon so as to be spaced apart from each other; and a pair ofelastic members 530 each connected at one end thereof to any one of thepair of second hanging holes 521 of each of the pair of second hangingmembers 520 and connected at the other end thereof to each of the pairof first hanging holes 511 of each of both end portions of the firsthanging member 510.

Herein, the first hanging holes 511 of the first hanging member 510 areformed in plural numbers at both ends of the first hanging member 510 soas to be spaced apart from each other.

The purpose of providing the first hanging hole 511 and the secondhanging hole 521 in plural numbers is to adjust a tensile force of theelastic member.

Each of the pair of second hanging members 520 is formed in a flat plateshape, and extends radially outwardly from both opposite sides of theouter circumferential surface of the main discharge tube 410.

The connection tube 115 interconnecting the connection tube 120 and thecorrugated tube 200 preferably includes a first connection part 115 aconnected to the connection tube 120 and a second connection part 115 bconnected to the corrugated tube 200 so that the first connection part115 a and the second connection part 115 b are coupled to each other.

Odor Prevention Unit 600

Referring to FIGS. 2 to 5, the odor prevention unit 600 is disposedinside the corrugated tube 200 or the sewage discharge tube 400, and isopened when the sewage flows through the corrugated tube 200 or thesewage discharge tube 400 and closed when the sewage does not flowtherethrough.

The odor prevention unit 600 includes an odor prevention member 610 thatis disposed at the inside of the sewage discharge tube 400, is formed ina hollow shape, and is made of vinyl or thin rubber having flexibility.

Preferably, the odor prevention unit 600 has a hollow shape and isformed of vinyl or rubber having flexibility.

Herein, one end of the odor prevention member 610 is fixed to one end ofan inner circumference of the sewage discharge tube 400. A process offixing the odor prevention member 610 may be performed by using anadhesive.

The other end of the odor prevention member 610 is disposed to form afree end along the other end of the inner circumference of the sewagedischarge tube 400. In other words, the other end of the odor preventionmember 610 is not fixed at the inside of the sewage discharge tube 400.

Accordingly, when sewage contained in the bowl 110 flows into thecorrugated tube 200 through connection tube 120, it can be introducedinto a hollow space of the odor prevention member 610 to open the odorprevention member 610.

In this case, a circumference of the odor prevention member 610 islarger than the outer circumference of the sewage discharge tube 400 sothat the odor prevention member 610 can be closely abutted against theouter circumference of the sewage discharge tube 400.

In addition, when the discharge of the sewage from the sewage dischargetube 400 is completed, the outward shape of the other end of the odorprevention member 610 disposed to form the free end is changed to beclosely abutted against the sewage discharge tube 400.

In other words, after the discharge of the sewage contained in the bowl110 has been completed, the other end of the odor prevention member 610is closed by being closely abutted against the sewage discharge tube 400

Accordingly, the other end of the odor prevention member 610 ismaintained in a relatively closed state, and thus it is possible tominimally reduce foul odor generated from a side from which sewage isdischarged.

While the sewage discharge device for a variable type water-saving flushtoilet according to the present invention have been described andillustrated in connection with specific exemplary embodiments withreference to the accompanying drawings, it will be readily appreciatedby those skilled in the art that it is merely illustrative of thepreferred embodiments of the present invention and various modificationsand changes can be made thereto within the spirit and scope of thepresent invention, set forth in the claims.

What is claimed is:
 1. A sewage discharge device for a variable typewater-saving flush toilet, comprising: a toilet body (100) installed ona floor or a wall, the toilet body (110) including a flushing waterinlet port (111) formed therein so as to allow for inflow of flushingwater flowing through a flushing water inflow passage (101) into whichthe flushing water is introduced from the outside, a bowl (110) openedat a top thereof and configured to store a certain amount of sewagetherein, a connection tube (120) configured to discharge sewage from thebowl (110), and a cover part (140) configured to cover a rear portion ofthe bowl (110) and allow sewage discharged through the connection tube(120) to be induced to a bottom tube (130); a corrugated tube (200)connected to the connection tube (120), the corrugated tube (200) beingconfigured to form a flow path of sewage drained from the bowl (110) andbeing capable of bent in one direction; a flushing water branching unit(300) fluidically connected with the flushing water inflow passage (101)and to allow a part of the flushing water flowing through the flushingwater inflow passage (101) to be branched when the flushing water isintroduced into the bowl (110); a sewage discharge tube (400)comprising: a main discharge tube (410) connected to the corrugated tube(200) and configured to discharge sewage to the outside: and anauxiliary tank (420) disposed on an outer circumferential surface of themain discharge tube (410) and configured to store therein flushing waterbranched from the flushing water branching unit (300) and suppliedthereto, the auxiliary tank having an auxiliary discharge hole (422)formed thereon to allow flushing water stored in a lower portion thereofto be drained, wherein when the flushing water branched from theflushing water branching unit (300) reaches a preset amount, theauxiliary tank (420) is downwardly moved by its own weight so thatsewage is discharged to the outside through the main discharge tube(410), and the time during which sewage is discharged to the outsidethrough the main discharge tube (410) is delayed in proportion to adischarge speed at which the flushing water supplied to the auxiliarytank (420) is drained through the auxiliary drain hole (422); and anelastic unit (500) configured to elastically interconnect the connectiontube (120) and the sewage discharge tube (400), and to allow the sewagedischarge tube (400) to be oriented in an upright state by an elasticforce of the elastic unit upon the interruption of the supply offlushing water.
 2. The sewage discharge device for a variable typewater-saving flush toilet according to claim 1, wherein the elastic unit(500) comprises: a first hanging member (510) mounted on a connectiontube (115) interconnecting the connection tube (120) and the corrugatedtube (200) so as to be protruded to both sides, the first hanging memberhaving a pair of first hanging holes (511) formed at each of both endportions thereof; a pair of second hanging members (520) mounted on bothsides of the sewage discharge tube (400), each of the second hangingmembers (520) having a pair of second hanging holes (521) formed thereonso as to be spaced apart from each other; and a pair of elastic members(530) each connected at one end thereof to any one of the pair of secondhanging holes (521) of each of the pair of second hanging members (520)and connected at the other end thereof to each of the pair of firsthanging holes (511) of each of both end portions of the first hangingmember (510).
 3. The sewage discharge device for a variable typewater-saving flush toilet according to claim 1, further comprising anodor prevention unit (600) disposed inside the corrugated tube (200) orthe sewage discharge tube (400), the odor prevention unit being openedwhen the sewage flows through the corrugated tube (200) or the sewagedischarge tube (400) and closed when the sewage does not flowtherethrough.
 4. The sewage discharge device for a variable typewater-saving flush toilet according to claim 1, wherein the flushingwater branching unit (300) comprises: a branching corrugated tube (310)coupled at an upper end thereof to the flushing water inflow passage(101) and connected at a lower end thereof to the auxiliary tank (420);and a branched water inlet part (320) connected to the upper end of thebranching corrugated tube (310) and disposed at the inside of theflushing water inflow passage (101).
 5. The sewage discharge device fora variable type water-saving flush toilet according to claim 1, whereinthe flushing water branching unit (300) further comprises an odorprevention valve (321) disposed at an entrance portion of the branchedwater inlet part (320), and configured to be opened by a hydraulicpressure when flushing water is supplied to the flushing water inflowpassage (101) and closed by the odor prevention valve's own weight whenthe supply of the flushing water is interrupted so that foul toilet odoris prevented from flowing into the flushing water inflow passage (101).6. The sewage discharge device for a variable type water-saving flushtoilet according to claim 3, wherein the odor prevention unit (600)comprises an odor prevention member (610) that is disposed at the insideof the sewage discharge tube (400), is formed in a hollow shape, and ismade of vinyl or thin rubber having flexibility, wherein one end of theodor prevention member (610) is fixed to one end of an innercircumference of the sewage discharge tube (400), and wherein the otherend of the odor prevention member (610) is disposed to form a free endalong the other end of the inner circumference of the sewage dischargetube (400), whereby when sewage contained in the bowl (110) flows intothe corrugated tube (200) through connection tube (120), it isintroduced into a hollow space of the odor prevention member (610) toopen the odor prevention member (610), and whereby when the discharge ofthe sewage from the sewage discharge tube (400) is completed, theoutward shape of the other end of the odor prevention member (610)disposed to form the free end is changed to be closely abutted againstthe sewage discharge tube (400).